Potty training help

My 2 year old tells me “poop” I see him running around holding it in and comes back to me saying “poop” he continues to do this..so I take him to the potty and he sits on it for a few seconds and wants down. So I pull his diaper up and he ends up doing the same thing but doesn’t wanna poop in the potty.

The other week I knew he was about to poop so he was bending down and I had no diaper on him and basically caught his poop in his potty.

Anyone else’s baby do this??